Hi Don, Movies are easy. They need to be uploaded to YouTube. Get an account if you don't have one.
You will paste the share link of the selected youtube video into your table thread.
Open up "Don's Table in the Engineer's Hall as a "new topic".
For pictures you will go to where it says attach below the writing pane.
Select "choose file". find your picture and select it.
Put the cursor and click where you want the picture in the writing pane.
Then go to the right of the choose file line, open the drop down and select "inline full size image"
click "more attachments" if you want another picture uploaded.
When ready click "Post" in the bottom right.
Engineers Hall will remain open until Monday night.